Individual pulses captured with a fast time base. Infinite persistence reveals poorly controlled pulse characteristics. The pulse width is about 100 μs to 250 μs, peak voltage is about 140 V typical, but can be as high as 200 V.

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1. niconiconi (niconiconi@cybre.space)'s status on Tuesday, 25-Jan-2022 05:06:10 UTC niconiconi

   in reply to

   More USB killer waveforms captured, unlike the last test (see thread) with an open circuit, this time it's connected to a 50 Ω load.

   It keeps pulsing once it's connected, peak voltage is typically 140 V, but can be as high as 200 V. Pulse width is about 100 μs to 250 μs. Repetition rate is about 27 pulses per second. The pulse characteristics are poorly controlled, I suspect it's triggered by the arcing inside a gas discharge tube, typically used for surge protection (the irony...).

   Like the last unit, this (identical) one also damages itself after continuously pulsing for a minute or so. It can no longer generate continuous pulses. #electronics #usb